User blog comment:FluffyMermaid78/Ask Mew!/@comment-32658700-20180106003607/@comment-34043027-20180106010203

I am the oldest. The reason Mewtwo comes in the Pokédex before me is because they thought that I was extinct, so they put Mewtwo in and didn’t include me. But when they discovered I was still alive, they put me in as #151. I don’t really know how old I am. I am the creator of all Pokémon, so I’ve been around for a pretty long time.